A skull with evidence of a form of mortuary disposal unknown in the study area was found in a human osteological collection from the Museo de La Plata. In order to get information about the exact provenance and context of discovery of the burial a number of techniques and methodologies of analysis were implemented (literature review, analysis of taphonomic and cut mark traces) while promoting the conservation of the bioarchaeological record (by means of the application of non-invasive imaging techniques). As a result, a novel mortuary practice without precedents in the bibliography of north Patagonia is presented. Furthermore, the crucial importance of the treatment, preservation and study of bioarchaeological collections is emphasized.